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CHANDLER, Ariz. (AP) -- Officials at Intel's manufacturing plant in Chandler say a faulty O-ring may be to blame for a nitrogen leak that sent a dozen workers to the hospital.

The Chandler Fire Department was called to the plant near Dobson and Queen Creek roads early Saturday after the leak was reported.

Battalion Chief Tom Dwiggins says a total of 43 people were treated and 12 of them ended up being transported to the hospital for complaints that included breathing difficulties, skin and eye irritation and nausea.

Dwiggins says all of them are in stable condition.

Intel spokeswoman Rachel Sutherland says the leak involved the exhaust system from one of the plant's production tools in Fab 32.

She says the incident didn't affect production, but the company is continuing to investigate.